| CNG |
LPG |
| Constituent Value Tolerance |
Characteristics Requirement |
 |
Wobbe Number 1350 +/- 20
|
|
Water, lbs/million ft 3 0.5 Maximum
|
|
Hydrogen Sulphide, grains/100 ft 3 0.1 Maximum
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| |
Other Soluble Sulphide, grains/100 ft 3 0.1 Maximum
|
|
Carbon Dioxide, vol. % 3.0 Maximum
|
|
Oxygen, vol. % 1.0 Maximum
|
|
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Vapour pressure (gauge) @ 40°C, kPa
|
| |
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| |
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| |
|
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Min. 520 |
|
Max. 1050 |
|
| Constituent Value Tolerance |
|
Hydrocarbons and heavier, mol-%, Max. 2.0 |
|
|
Methane 80 Minimum |
|
Ethane 10 Maximum |
|
C 3 and Higher HC 5.0 Maximum |
|
C 6 and Higher HC 1.0 Maximum |
|
Total Unsaturated HC 1.0 Maximum |
|
|
Dienes (as 1,3 Butadiene), mol-%, Max. 0.5
|
|
Total volatile sulphur (after stanching) ppm, Max. 150
|
|
Copper strip corrosion @ 40°C for 1 hour, Max. Class 1 |
|
Hydrogen sulphide To Pass the test |
|
Evaporation residue, mg/kg, Max. 100
|
|
Free water content Nil
|
|
| Other Specifications (mole %) |
Other Specifications |
|
Hydrogen 0.1 Maximum |
|
Carbon Monoxide 0.1 Maximum |
|
C 3 and Higher HC 5.0 Maximum
|
|
C 6 and Higher HC 1.0 Maximum
|
|
Total Unsaturated HC 1.0 Maximum
|
|
|
Motor octane number (MON), Min. 88
|
|
Odour Unpleasant and Distinctive down
|
|
| Other Requirements |
Other Requirements |
|
Free from liquids over the entire range of temperatures and pressures encountered in the engine and fuel system.
|
| |
Free from solid particulate matter
|
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In winter, the gauge vapour pressure requirement shall be minimum 700 kPa at 40°C. Winter period shall be from 1 st November to 15 th February.
|
|
The water content shall be determined at the Refinery/First Dispatching Location.
|
|
Product shall contain 20 ppm, min. ethyl mercaptan at the first dispatching location to ensure the detection of leakage by odour
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